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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// Test various cases where we permit an unconstrained variable
// to fallback based on control-flow.
//
// These represent current behavior, but are pretty dubious. I would
// like to revisit these and potentially change them. --nmatsakis
#![feature(never_type)]
trait BadDefault {
fn default() -> Self;
}
impl BadDefault for u32 {
fn default() -> Self {
0
}
}
impl BadDefault for ! {
fn default() -> ! {
panic!()
}
}
fn assignment() {
let x;
if true {
x = BadDefault::default();
} else {
x = return;
}
}
fn assignment_rev() {
let x;
if true {
x = return;
} else {
x = BadDefault::default();
}
}
fn if_then_else() {
let _x = if true {
BadDefault::default()
} else {
return;
};
}
fn if_then_else_rev() {
let _x = if true {
return;
} else {
BadDefault::default()
};
}
fn match_arm() {
let _x = match Ok(BadDefault::default()) {
Ok(v) => v,
Err(()) => return,
};
}
fn match_arm_rev() {
let _x = match Ok(BadDefault::default()) {
Err(()) => return,
Ok(v) => v,
};
}
fn loop_break() {
let _x = loop {
if false {
break return;
} else {
break BadDefault::default();
}
};
}
fn loop_break_rev() {
let _x = loop {
if false {
break return;
} else {
break BadDefault::default();
}
};
}
fn main() { }
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